You are not going blind. Here's the science...
In the olden days, manufacturers added blueing agents to washing powder. These agents absorb and reflect certain wavelengths of light to give the illusion of brighter whiteness instead of a creamy, yellowish colour.
Old 'uns amongst us will remember washing detergents being advertised containing "blue whitener" which sounds a bit daft but really explains the same thing.
Therefore, the blue and white stripes of WBA compared to the bluey/white of the SW change strip meant that, especially from a distance where the TV cameras were placed, both shirts looked remarkably similar (i.e. bright white).
I would have thought that the TV companies ( and possibly even the referee) might have realised this and got one or either side to change strip but, as our second strip is white anyway, it would not have made much difference.